Canonical Formulas for K4, Part I: Basic Results

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\begin{bibtex} @article{DBLP:journals/jsyml/Zakharyaschev92,

 author    = {Michael Zakharyaschev},
 title     = {Canonical Formulas for K4, Part I: Basic Results},
 journal   = {J. Symb. Log.},
 volume    = {57},
 number    = {4},
 year      = {1992},
 pages     = {1377-1402},
 bibsource = {DBLP, http://dblp.uni-trier.de}

}

\end{bibtex}